Generally, I believe men are better at poker. However, I have come across a few women who usually give men a run for their money. Heck, I've been wowed by some women's skills.
Men are better players than women. I have never see any woman who can compete with me in game of poker. Perhaps, i have never competed professionally with any woman. There many be some professional women poker players. In my opinion, poker game seems to be men's thing.
It is not a male or female thing, players can be good or bad irrespective of the gender. Some may find that the dynamics differ when playing against females or males.
I don't think the gender of my opponent on the poker table would matter to me I have never played poker against a woman. I have never seen any woman that plays poker in my country. I have always played against menfolk.
Honestly, it doesn't really matter to me. I just focus on playing good poker regardless of who's at the table. Some people say women are tighter or men are more aggressive, but I think that's just stereotypes. Everyone has their own style that has nothing to do with gender.